Circuit-closer for electric alarms



(No Model.)

L. A. BRIGEL.

CIRCUIT CLOSER FOR ELECTRIC ALARMS.

No. 287,618. Patented Oct. 30, 1883.

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UNITED STATES PATENT OFFICE.

LEO A. BRIGEL, OF CINCINNATI, OHIO.

CIRCUIT-CLOSER FOR ELECTRIC ALARMS.

SPECIFICATION forming part of Letters Patent No. 287,618, dated October30, 1883,

Application filed August 24, 1883.

To aZZ whom it may concern.-

Be it known that I, LEO A. BRIGEL, of Oincinnati, Hamilton county, Ohio,have invented a new and useful Improvement in Circuit-Glosing Devicesfor Electric Alarms, of which the following is a specification.

My invention is an improvement in the class of circuit-closers forelectric alarms in which a flexible board provided with intersectingwires that constitute the terminals of an electric alarm are held out ofcontact at their intersections by springs, so as to present an open orincomplete circuit which is closed or completed and the electric alarmsounded by the depression of one or more of the said springs by anyperson walking over or setting foot on the same.

In the accompanying drawings, Figure l is a perspective under side view,and Fig. 2 is a vertical section, of a eircuitrcloser embodying myinvention. Fig. 3 is a vertical section of one of the intersections inits open condition. Fig. 4 is a vertical section of the same in theclosed condition. Fig. 5 shows one of the springs detached.

A represents a sheet or board, preferably of the material known astar-board, molded to the represented pan form, and slit and perforated,as at a and a.

P and N represent the terminal portions of two wires that form part ofan open circuit communicating with an electric alarm of any suitableconstruction. These wires are interwoven in or otherwise attached to theboard, so as to intersect one another, preferably at right angles, byengagement in the slits a and perforations a, as shown. Of these wires,one say wire P-is held aloof from the other wire at the places ofintersection by means of metallic springs G of the represented curvedform. Each spring is so attached at one of its ends, by means ofclinched tin or copper tacks D, to the board as to straddle, in themanner shown, a part of the wire 1?, near an intersection, and each hasan orifice, 0, preferably a little beyond its mid-length, as indicated,through which the same wire, I, is rove, and so on at each spring insuccession. By this means contact of one wire with the other is madeimpossible, except by a considerable pressure exerted upon the board ator near one or more of the intersections-such, for example, as would bemade by the foot of a person walking over or stepping upon the board.

(N0 model.)

its cheapness, durability, and its impermea- I bility to moisture,exemption from vermin, &c. The device is believed greatly superior toany for like purpose heretofore devised in the important respects ofsimplicity an d economy of manufacture, ei'iiciency, cheapness, anddurability.

An important benefit incident to the described pan form which brings theedges close to the floor consists in the exclusion of dust, which inkindred devices often destroys the eiiiciency of the apparatus by eitherclosing or preventing closure of the circuit. Another benefit consistsin the relief of the springs from severe pressure against the floor inconsequence of the downturned margin of the board upholding theintermediate portions well clear of the floor.

I claim as new and of my invention- 1. A circuit-closer for electricalarms, con sisting of the elements following, to wit: flexi- .ble boardA, two wires, I N, that constitute the terminals of an open circuit ofan electric alarm, and which are so attached to the board as tointersect one another at or near right angles, and of which one is heldaloof from the other by curved springs C, attached to the board, andthrough orifices c, in which the said wire is rove, substantially as andfor the purposes set forth.

2. In a circuit-closer for electric alarms, the combination of thedescribed slit, perforated and pan-formed tar-board A, the attachedperforated springs O, and the two electricalarm terminals 1 N, of whichboth are so rove through the slits and perforation of the said board,and one of them through the ori fices of the springs, as to intersectone another without contact, substantially as and for the purposes setforth.

In testimony of which invention I hereunto set my hand.

LEO A. BRIGEL.

